Source: IBM Microelectronics (via archive.org) (1996/1997)

DRAM

Understanding DRAM Operation (newer rev.) Read and write cycles
Understanding DRAM Performance Specifications
EDO - Extended Data Out (Hyper Page Mode) Fast Page Mode and EDO cycles
1K/2K/4K Refresh on 16Mb DRAMs
Synchronous DRAM: The DRAM of the Future (From 1Q96 MicroNews)

DRAM Modules

Overview
Fault Tolerance Design Decisions in Memory
Error Indicator Lines on ECC-On-SIMM Modules
72 Pin SIMM Characteristics

VRAM

Understanding VRAM and SGRAM Operation (newer rev.)

SRAM

Understanding SRAM Operation (newer rev.)